current bounds on the number of colors: 0 -- 36 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:48 2012 Optimize a model with 1296 rows, 718 columns and 4428 nonzeros Presolve removed 1 rows and 18 columns Presolve time: 0.01s Presolved: 1295 rows, 700 columns, 4410 nonzeros Variable types: 0 continuous, 700 integer (700 binary) Root relaxation: objective 0.000000e+00, 78 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (134 simplex iterations) in 0.01 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 18 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:48 2012 Optimize a model with 666 rows, 394 columns and 2214 nonzeros Presolve removed 1 rows and 9 columns Presolve time: 0.00s Presolved: 665 rows, 385 columns, 2205 nonzeros Variable types: 0 continuous, 385 integer (385 binary) Root relaxation: objective 0.000000e+00, 73 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (118 simplex iterations) in 0.00 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 9 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:48 2012 Optimize a model with 316 rows, 214 columns and 984 nonzeros Presolve removed 1 rows and 4 columns Presolve time: 0.00s Presolved: 315 rows, 210 columns, 980 nonzeros Variable types: 0 continuous, 210 integer (210 binary) Root relaxation: objective 0.000000e+00, 76 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time * 0 0 0 0.0000000 0.00000 0.0% - 0s Explored 0 nodes (176 simplex iterations) in 0.00 seconds Thread count was 1 (of 16 available processors) Optimal solution found (tolerance 1.00e-04) Best objective 0.000000000000e+00, best bound 0.000000000000e+00, gap 0.0% current bounds on the number of colors: 0 -- 4 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:48 2012 Optimize a model with 176 rows, 142 columns and 492 nonzeros Presolve removed 36 rows and 37 columns Presolve time: 0.00s Presolved: 140 rows, 105 columns, 420 nonzeros Variable types: 0 continuous, 105 integer (105 binary) Root relaxation: objective 0.000000e+00, 41 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 35 - 0.00000 - - 0s Explored 0 nodes (143 simplex iterations) in 0.00 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound 1.000000000000e+00, gap - current bounds on the number of colors: 2 -- 4 Gurobi 5.0.1 (linux64) logging started Thu Dec 13 19:35:48 2012 Optimize a model with 246 rows, 178 columns and 738 nonzeros Presolve removed 1 rows and 3 columns Presolve time: 0.00s Presolved: 245 rows, 175 columns, 735 nonzeros Variable types: 0 continuous, 175 integer (175 binary) Root relaxation: objective 0.000000e+00, 76 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 0.00000 0 36 - 0.00000 - - 0s 0 0 0.00000 0 63 - 0.00000 - - 0s 0 0 0.00000 0 42 - 0.00000 - - 0s 0 0 0.00000 0 75 - 0.00000 - - 0s 0 0 0.00000 0 58 - 0.00000 - - 0s 0 0 0.00000 0 45 - 0.00000 - - 0s 0 0 0.00000 0 51 - 0.00000 - - 0s 0 0 0.00000 0 26 - 0.00000 - - 0s 0 0 0.00000 0 60 - 0.00000 - - 0s 0 0 0.00000 0 39 - 0.00000 - - 0s 0 0 0.00000 0 66 - 0.00000 - - 0s 0 0 0.00000 0 66 - 0.00000 - - 0s 0 2 0.00000 0 66 - 0.00000 - - 0s Cutting planes: Clique: 1 Zero half: 5 Explored 5 nodes (1790 simplex iterations) in 0.07 seconds Thread count was 1 (of 16 available processors) Model objective exceeds cutoff Best objective -, best bound -, gap - optimal solution found: number of colors: 4